The challenge of the tangram, the original "Chinese puzzle," lies in your ability to arrange seven geometrical pieces - a square, a rhomboid, and five triangles - into a variety of different shapes. Collected by Sam Loyd, America's great puzzle expert, these 700 endlessly absorbing tangrams offer hours of mind-expanding amusement. Sam Loyd's The Book of Tangrams is also a tribute to this tricky and intriguing puzzle. In a famous and delightful spoof...